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Indian Ocean, a body of salt water covering approximately one-fifth of the total ocean area of the world. It is the smallest, geologically youngest, and physically most complex of the world’s three major oceans. It stretches for more than 10,000 km between the southern tips of Africa and Australia and, without its marginal seas, has an area of about 73,440,000 square km. The Indian Ocean’s average depth is 3,960 meters, and its deepest point, in the Sunda Deep of the Java Trench off the southern coast of the island of Indonesia, is 7,450 meters.
